Question about 2003 Cadillac CTS
Hello. perhaps I can assist you.
Perform this test:
Fuel pump test:
1. Get yourself a helper.
2. remove the gas cap.
3. have one person listen in the gas tank at the gas cap opening.
4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.
5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.
6. Does it ?.
If you do NOT hear it run, in most cases the fault is the fuel pump relay or the fuel pump..
As soon as you turn ON the ignition switch to start the engine a 2 second ONLY battery voltage signal is sent from the computer to the fuel pump relay and from the relay back to the fuel pump in the fuel tank. This runs the fuel pump for ONLY 2 seconds of which pressurizes the fuel system in preparation to start the engine.
Once the engine starts, The computer BYPASSES the fuel pump relay and sends constant contionous battery voltage from the computer to the oil pressure switch of which is now CLOSED because the oil pressure is UP because the engine is running. Therefore the battery voltage flows thru the oil pressure switch back to the fuel pump to run the fuel pump constantly until you turn OFF the engine.
Posted on Oct 01, 2009
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Nov 23, 2015 | 2001 Mercury Grand Marquis
Dec 30, 2014 | Cars & Trucks
Nov 20, 2014 | Ford Cars & Trucks
Jan 01, 2013 | 1993 Pontiac Bonneville
Feb 10, 2011 | 2003 Jaguar X-Type
Mar 31, 2017 | 2000 Oldsmobile Silhouette
Apr 16, 2009 | 1984 Nissan Pickup
312 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: